You can improve your gas mileage by 0.6% on average—up to 3% in some cases—by keeping your tires inflated to the proper pressure. Under-inflated tires can lower gas mileage by about 0.2% for every 1 psi drop in the average pressure of all tires. Properly inflated tires are safer and last longer.
The proper tire pressure for your vehicle is usually found on a sticker in the driver's side door jamb or the glove box and in your owner's manual. Do not use the maximum pressure printed on the tire's sidewall.
Maintain proper PSI for better performance
Tire efficiency is all part of getting maximum return on investment for anything related to your automobile. Maintaining the proper psi will allow your tires to last months or even years longer than ordinary. It also means that the miles per gallon are the best that can possibly be gotten out of your car’s fuel. It all adds up over time. Very simple inspection tires and proper inflation can save you hundreds of dollars over the life of the tires.
Studies have proven that the Fuel Use index increased dramatically while the tire pressure decreases (under-inflated). And as you can see in the graphics below, the right-hand chart reflects the very situation of how the underinflated tire can raise fuel use.
Knowing Your Exact Tire Pressure Reading
All that being said, to know your tire pressure readings all the time can really help you improve your gas mileage. For those old vehicles that aren't equipped with TPMS that has exact readings, we highly recommend our ZUS Smart Tire Safety Monitor. It gives you the tire readings in real-time while you drive.
What’s more, you can get pressure reading history graphic for the last 24 hours & last 30 days when you click on the specific tire.